The working portion consists of pump rotors formed by multi-stage impellers arranged in the same direction and the blower inlet casing forming diversion space in its periphery. The pump rotor consists of impeller, pump shaft, key and axle sleeve etc. The impeller is a core component converting energy in prime motor into liquid energy to be transmitted by pump. The pump shaft not only acts as the carrier of impeller, but also transmits the complete load of rotor. The function of blower inlet casing is to lead the liquid flowing from impeller and then evenly enters into the next level of impeller, with minimum loss. The connection of blower inlet casing is seam allowance location, which is finally screwed down with bolt.
The outflow portion consists of the connecting pipe and pump base and so on; the transmission shaft of pump passes through from the center of this part; the liquid flowing from the working portion of the pump horizontally enters into the pressure piping outside the pump through this part. The pump base is provided with seal body, pressure–relief hole and steam-bleeding hole. The pressure-relief hole is used to reduce the pressure in shaft seal cavity to the lowest; the steam-bleeding hole is used to exhaust the gas in pump cylinder to the condenser timely.
The function of condensate pump is to pump the water condensed in the condenser of steam turbine from hot well and pump it to the deaerator via the heater, then the water of deaerator re-enters into the boiler to be heated via water supply pump, then turns into steam and apply work in steam turbine, thus accomplishing steam-water-steam circulation. The condensate pump is used to pump the water condensed in the hot well of condenser to the low-voltage heater for being heated and then pump it to the deaerator. The condensate water will be deoxygenized again in deaerator and heated to about 104 ℃。
The condensate pump is in high vacuum in standby application. Therefore, it is very necessary for condensate pump to have reliable shaft- seal. The shaft seal of condensate pump can be gland packing or mechanical seal. In addition, the condensation water shall be used as seal cooling water. If other sources of water are used for sealing, they will pollute condensate water, so the condensate water is used as seal water.
Type of structure:
The first grade of shell is calathiform shell or spiral shell, the secondary and the last shell are calathiform shells; the pump shaft is equipped with radial direction bearing at many places. The axial direction load of pump rotor can be supported by the thrust bearing of pump itself, and can be supported by the motor; the shaft seal can be packing seal or mechanical seal. The pump rotor shafting system includes two shafts. The connection between shafts is snap ring cylinder type of coupler. The connection between pump and motor is elastic pin coupler or rigid coupler connection; the suction and outlet(disgorging) interface are located in pump cylinder and outlet base respectively, and are laid in 180° horizontally( it can be shifted at random according to the integral multiple of 15°).
